function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bahls, Loren', 2],
    ['Glushchenko, Anton & Gusev, Evgeniy & Maltsev, Yevhen', 1],
    ['Gong, Zhijun & Li, Yanling & Metzeltin, Ditmar', 1],
    ['Guo, Ji-Shu & Meng, Wen-Wen & Kociolek, John Patrick', 1],
    ['Levkov, Zlatko & Williams, David M.', 1],
    ['Meng, Wen-Wen & Guo, Ji-Shu & Zhang, Yu & Kociolek, John Patrick', 1],
    ['Udovič, Marija Gligora & Kulaš, Antonija & Šušnjara, Mirela', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=8)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);